Join length-weights and nutritional parameters info to preprocessed landings

The function integrate nutritional info from the get_nutrients_table function and length-weight info from FIshBase databse to preprocessed surveys data and convert catch labels according to the FAO nomenclature (http://www.fao.org/fishery/statistics/global-production/3/en).

Usage

join_weights(data, rfish_tab, nutrients_table)

Arguments

data

The merged long landings table

rfish_tab

Table with length weight parameters

nutrients_table

Table with nutritional parameters

Value

The long landings table with weight and nutrients added

Length types

Every length reaching this function is a total length. v2 and v3 record TL; v1 recorded fork length and was converted once, at the freeze (done once in the freeze).

Input and output shape

Both are the flat long table — one row per (submission, catch, length bin) — with the taxon already resolved from the assets snapshot by preprocess_landings(). The output adds weight (grams) and the seven per-catch nutrient columns and changes nothing else.